Electromagnet.



G. W. HENRY.

ELBGTBOMAGNET.

APPLICATION FILED JULY 31, 1907.

904,87 1 Patented Nov. 24, 1908.

2 $HEETS.SHVEET 1.

- W. HENRY.

I ELEGTROMAGNET. APPLIOATION FILED JULY 31, 1907.

Patented Nov. 24, 1908.

2 SHEETS-SHEET 2.

Fliiliiiill Gear emu/r amounts c )jigww 1 l 4'0 i Similar referencenumerals designatc coi" mg power of the armature due to tions; thusgreatly ,simpli ying the structure.

' of the armature and operatinglever. Fig 7 F "laminae l3;;and 14riveted respectively to the opposite sides of the .55

the following is a specificziti'dn'? by the change of;leverage ofstheoperating member actuatedgby said armature, so that 15"-fasten'ingmeans. Flatcoils are located .--cor,e plates. Spaced'poles12 project from I I vm n m) s TEs Pa n-2N1 OFFICE.

GEORGE WASH NGTON HENRY,-- or PrCIlILDRES SAND ONE-THIRD TO JOHNL.'LEQITIN, OF NEW YORK, N Y

ELEGTBOMAGNET.

" Application mea iui s1, 907- Serial No. 386,480.

l-IENRY, a citizen of the United States, resid- 1ng; at New,-York, inthe county of New York and State of New York, have invented ianew anduseful Electromagnet, of which One of the important objects of thepresent; invention is to provide a novel, simple andpowerful magnet, inwhich the increasits approach to the poles of the magnet is resisted theoperating power developed by the mag- ;net [remainsv substantially.constant during the entire movement of the armature.

,A further. object is -to provide a novel construction.- of magnetwherein certain. parts are made, to perform alurality of tune- Stillanother object is to provide novel means for cuttingdown the amount ofcurrent-flowing through the magnet after an armaturehas been attractedthereto, whereby sufficient is utilized to hold the armature.

The preferable embodiment of the inven-. tion is illustrated in theaccompanying draw- --Figure 1 is a side elevation of the magnet. Fig. 2is alongitudinalseetional view therethrough. Figs. 3 and 4:. arerespectively cross sectionalyviews ,on the ;-line. 3+3 and l -"l of Fig;l.-, Fig.1 5. is adetail sectional view showinglthe means for breakingthe short circuit. Fig. (Sis a detail perspective view is a fi iwillustratin the C1. cuits. I

responding parts in ;all the figures of the drawings, I In theembodiment illustrated an electromagnet is employed that has ahorseshoelaminated core, the-plates Sthereofbeing held together fby rivets 9 orother suitable on the arms of, the core, and abutted-against plates 11securedto theopposite sides ofthe 1 the-coils, and include retainingplates or core plates, and abutof the coils, as illusting against theends Specification of Letters Patent.

beyond the ends of the core plates.

Patentedl Nov. 24, 1908.

trated in Figs. 3 and 4. thus effectively mamta ming the coils againstdetachment.

It Wlll be observed by reference to Figfll' NEW YORK, N.Y.,Ass1,sNoR- orONE-THIRD To that the plates or laminae 13 project beyond the ends ofthe core plates, 8, thus forming ears 15, and a. laminated armature 16is provided with, an ear 1?. located between the.

ears and pivoted thereto, as shown at 18. The armature is substantiallyin the form of a half disk, and coact swith both-poles, operatinginr'ecesses. or cutaway portions 19.. formed in the opposing edges ofthe poles. It is 'to be notedthat theCut-away portions provideconvergentinner 'walls to the poles of the magnet, and that the coactingcon-' vergent edges of 'the'umature are movable into ando ut ofengagement therewith, "An operating'lever is pivotally connected asshown at 21 to the freefend'of the armature and operates between guideflanges 22 formedby the extension of the side plates .14 Said ends arepreferably rounded slightly, as illustrated at 23, and the lever has arocking bearing or shiftable fulcrum 24L upon the rounded ends.

A bracket 25 is secured to one end of'the magnet, and a resistance coil:26 is mounted thereon. An electric circuit 27, which includes the coilslOand resistance ilfifalso ineludes a suitable source of electricalenergy 28 and a suitable circuit controlling device 29, the latter partsbeing illustrated diagrammatically in Fig. 7. A short circuit around theresistance 26, includes the coils 10 of the magnet, thesource ofelectrical energy 28 and a circuit closer 30. This circuit closerconsists of relatively movable contact elements 31 and 32; the'terminals of which are normally in engagement. a 1 The outer armof thelever20 operates between the contact elements 31and '32, and carries aninsulator plate'33 that is movablebeclosed,' the current willpass-through the short circuit and through the'coils of the magnet. Thussaid magnet will be energizcd, and the armature l6 drawn toward thepoles. twill be evident thatas said arma-' ture approaches the poles,the power thereof will be increased. During the initial movement, thefulcrum :20 will be at a comparatively great distance from the armature,but as said armature moves toward the pole, the fulcrum will shifttoward the armature. Consequently '-as the power of the armatureincreases, the power arm of the lever de creases, while the load arm ofsaid lever is lengthened. The result-is that the power delivered at thefree end of the arm 20 remains substantially constant throughout themovement of the armature. As said armature approaches the limit of itsmovement,

the insulator plate 33 will pass between the engaged terminalsof thecontact elements 31 and 32. Therefore the short circuit being broken,the electric current will have to traverse the resistance 26, reducingthe force of said current to a point at which it is only sufficient tohold the armature 16 to the magnet. Thus a simple and racticable ma etis provided, the power 0 which remains substantially constant, asalready described, said magnet being provided with means for cutting inand out resistance for the purpose of preventing waste of current.Moreover, in this structure, the pole plates 13 and 14., beside addingto the mass of the poles, constitutes retaining means for the coils, aswell as connections and guides for the armature and lever.

From the foregoing, it is thought that the construction, operation andmany advantagcs of the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size, shape, proportion, andminor. details of construction, may be resorted to without departingfrom the spirit 'or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination with a magnet, of an armaturecooperating therewith,and a lever having a 'shiftable fulcrum separate from the armature, saidlever having a movable connection with the armature that is separatefrom the fulcrum.

2. The combination with a magnet, of a swinging armaturecotiperatingtherewith, a lever having a'shiftable fulcrum separate fromthe armature, and a connection between said lever and armature that issepa rate from the fulcrum and constitutes means for transmitting motionfrom the armature to the lever.

3. The combination with a magnet, of an armature operated thereby, abearing, 'and a lever pivotally connected to' the armature and havinga.curved fulcrum portion that rocks upon the bearing. I

.4. Thecornbination with a magnet, of an armature cooperating therewith,and a letet' having a rocking fulcrum bearing and a pivotal connectionwith the armature that is separate from the fulcrum bearing.

5. The combination with a magnet, of a swinging armature cooperatingtherewith, a lever having a rocking fulcrum between its armature and onearm of-the lever.

6. The combination with a magnet having spaced poles, of a leverfnlcrumed on one pole, and an armature movably mounted on the other poleand having a movable connection with the lever.

'7. The combination with a magnet having fulcrum on one pole, and anarmature coacting with the poles and connected to the lever.

spaced poles, of a lever having a rocking bearing on one pole, and anarmature c0- acting with the poles and pivotally connected to the lever.

9. The combination with a magnet having spaced poles, of a leverfulcrumed between itsends on one pole, and an armature pivoted to one ofthe poles and to the inner end of the lever.

10. The combination with a horse shoe magnet, of a lever fulcrumed onone pole of said magnet, and an armature pivoted to the other pole andpivotally connected to the lever.

11. The combination with a horse shoe magnet having spaced poles, of anarmature pivoted to one pole and operating between.

fulcrum on the other pole and connected to the armature.

12. The combination with a horse-shoe magnet havin spaced poles providedwithconvergently. isposed inner sides, of an armature operating betweenthe poles and having convergent opposite sides that are movable into andout of coaction with the convergent inner sides of the poles, and alever connected to the armature and having a sliiftin fulcrum.

13. magnet including a horse shoe core, the poles of which have theiropposing portions cut away forming convergent inner walls, and anarmature pivoted to one of the poles and coacting with both, saidarmature operating in the cut away portions and engaging the innerwalls.

14'. A magnet having a laminated core provided with a polc, certain ofthe laminae of the core .being spaced apart by other lamina: andprojecting beyond the edges of said other laminae to form spaced ears,and

, 15. A magnet having a laminated core provided with a pole, certain ofthe laminat 1 of thecore beingspaced by other laminae l and projectingbeyond the ends of said other" spaced poles, of a lever having ashiftable said poles, and a lever having a shiftable ends, and a pivotalconnection between the 8. The combination with a magnet having anarmature pivoted to and between the ears. I

' coa'cting with the magic; and connected to yond the ends of the othersto form ears pole; a coil'surrounding the core, plates secured 'toopposite sides-of the pole and con- 40 x stituting retaining means forthe coil and projecting beyond the end of the pole forr nof the laminaebetween the same,-and an an with the magnet.

form guide flanges, theplates betwee'nhawof the poles, an armature pivopole, a coil surrounding t ecore', and plates on the ears.

.ing with the magnet and-connected to the fitn'iinae to form guideflanges, a lever operat mg between the flanges and against the ends;

mature connected to the lever and coacting" .16. A magnet having alaminated core provided witha pole, certain of the plates of the-coreprojecting beyond the others to ingtheir ends curved to provide abearing, a ever having a shifting fulcrum on the bearing between theplates, and an armature the lever.

' .17. A horse shoe magnet having a lanainated core provided with spacedpoles, oertain of the plates of the core projecting be.-

and guide flanges respectively on the endsto the ears,and a lever havinga shlftabl fulcrum between the lever and pivoted to the amine-- tures. W

[18. A magnet includin a core having a 20. A magnetfincludin'g a corehaving a stituting parts thereof, said plates also conmg spaced guideflanges, a lever, operating between the flanges, and an armaturecoact-t' leverrounding the arms of the. magnet, 's'ecuredto oppositesides of the, ole an constitutingretalning means magnet.

21 A horse-shoe magnet inclu a laminated core having spaced poles, coilssurf ;.t e coils, said plates projecting-beyond thexiids of'the polesforming respectively spaced'iears and-spaced guide flanges, an armature.piurotedto and between V the ears, said armature"' coacting with thepoles, and a lever having a-shiftable lates v fulcrum "between theguideflanges and pivotally connected to the armature.)

'22. The combination withi-tfl iljmflgn illcluding a horse shoe core andcoils! mounted on the, arms of said core, of an armature cooperatingwith the poles of thelmagnet and plvoted to one of the same, 'aleverfulcrumed on the'other pole "and pivotedtothe arma ture, an electriccircuit imaging-resistance and said'coils, a short ci t -around theresistance including the coils; and a circuit closer ope ted by thelever upon'the short} circuit wh n the armatureisoperated' by the 23.The combination with a magnet including a horse shoe core and coil'smounted on the arms oisaidcore; of anarmature coacting with thepit'oted to one of t e same,'a lever fulcrumed on the other pole andpivoted to the armature, an electric circuit including resistance andsaid coils, a short circuit around the resistance including the coils,and a'circuit closer comprlslj relatlvely movable contact.

in "gagement and an ci by tlitlever and movable elements norniainsulator operate etween the-contact elements to. se arate hem when thearmature is operated y the nagnet.

In testimony, that If claim-{he foregoing as oles of the magnet and I myown, I have hereto afi'ixdd my signature 1 in the presence oftwopwitnesses. GEORGE WASHING'ION HENRY. Witnesses;

' M. 'E. N'ns'ron,

J can 0. KNIGHT.

